Docker security in the future (Opensource.com)

Over at Opensource.com, Daniel Walsh writes about applying various Linux security technologies to Docker containers. In the article, he looks at using user namespaces and seccomp filters to provide better security for Docker. "One of the problems with all of the container separation modes described here and elsewhere is that they all rely on the kernel for separation. Unlike air gapped computers, or even virtual machines, the processes within the container can talk directly to the host kernel. If the host kernel has a kernel vulnerability that a container can access, they might be able to disable all of the security and break out of the container.The x86_64 Linux kernel has over 600 system calls, a bug in any one of which could lead to a privilege escalation. Some of the system calls are seldom called, and should be eliminated from access within the container."